JP2019043688A - Jib tilt mechanism and jib tilt method - Google Patents

Abstract

To provide a jib tilt mechanism capable of raising a jib with a simple structure without mounting hydraulic equipment dedicated for jib tilt.SOLUTION: The jib tilt mechanism includes a first wire 161, a first hook 171, first fixing means 51 for fixing a tip end of the first wire 161 to a tip end side of a boom head 144, a second wire 162, a second hook 172, and a first hook-in support 61 for fixing the first hook 171 to the boom head 144 as for a boom-side configuration and also includes a tension rod and a jib tilt wire as for a jib-side configuration. When the jib is raised, the first hook 171 is fixed to the boom head 144 by the first hook-in support 61 whereas the tip end of the first wire 161 is detached from the first fixing means 51 and connected to one end part of the jib tilt wire.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a dibutylt mechanism and a dibutylt method for raising and lowering a jib when assembling a jib of a mobile crane.

  Conventionally, there are mobile cranes that can be attached with a jib at the tip of the boom. There is a need for a technology that enables such a jib mounting operation and a jib lifting operation to be performed safely and easily.

  For example, Patent Document 1 describes a method of connecting a detachable jib to a boom head using a sub wire. That is, the jib mounting method of Patent Document 1 is a jib mounting method of a mobile crane provided with a plurality of hoisting devices, and in a state where the wire rope of one hoisting device is passed to the tip end side of the jib, the other hoisting The wire rope of the device lifts the proximal end of the jib to connect the jib to the boom.

Unexamined-Japanese-Patent No. 2006-341939

  However, although the jib attachment method of Patent Document 1 lifts the jib using the sub wire, it is not configured to raise and lower the jib by the sub wire. For this reason, a dibutyl cylinder is separately mounted for the purpose of raising and lowering the jib.

  Therefore, an object of the present invention is to provide a dibutylt mechanism and a dibutylt method that can raise and lower a jib with a simple configuration without mounting a dibutylt-dedicated hydraulic device.

  In order to achieve the above object, the dibutylt mechanism of the mobile crane according to the method 1 of the present invention; via the first wire drawn from the first winch and the first group of guide sheaves as the configuration on the boom side From the first hook hooked around the middle of the first wire, the first fixing means for fixing the tip of the first wire through the second group of the guide sheaves to the tip side of the boom head, and the second winch A second hook fed out, a second hook connected to the second wire via a third group of guide sheaves, and a first hook-in support for fixing the first hook to the boom head Provided as a configuration on the jib side, a tension rod stretched between the jib and the boom head, and a dibutyl wire for tensioning the tension rod; when raising the jib The first hook is fixed to the boom head by the first hook-in support, and the tip of the first wire can be removed from the first fixing means and connected to one end of the dibutyl wire It is supposed to be.

  In addition, the dibutylt mechanism of the mobile crane according to the method 2 of the present invention; as the boom side structure, the first wire drawn from the first winch and the middle of the first wire via the first group of guide sheaves. A second hook to which the first hook is hooked, a second hook to which the tip of the first wire is connected via the second group of guide sheaves, a second wire fed from a second winch, and a third group A second fixing means for fixing the tip of the second wire through the guide sheave to the tip side of the boom head; a first hook-in support for fixing the first hook to the boom head; and the second hook A second hook-in support fixed to the boom head; as a configuration on the jib side, tensioning a tension rod provided between the jib and the boom head and tensioning the tension rod A tip of the second wire can be removed from the second fixing means and connected to one end of the dibutyl wire when raising and lowering the jib. ing.

  The dibutylt method of the mobile crane according to the method 1 of the present invention is a dibutylt method of the mobile crane including the dibutylt mechanism according to the method 1, wherein the first hook is the boom head using the first hook-in support. Securing the boom head and the proximal end of the jib with a pin; removing the tip of the first wire from the first securing means; and one end of the dibutyl wire The steps of connecting and winding the first wire by the first winch are provided.

  Furthermore, the dibutylt method of the mobile crane according to the method 2 of the present invention is a dibutylt method of the mobile crane including the dibutylt mechanism according to the method 2, wherein the first hook is the boom head using the first hook-in support. Securing the boom head and the proximal end of the jib with a pin; removing the tip of the second wire from the second securing means; and one end of the dibutyl wire The steps of connecting and winding the second wire with the second winch are provided.

  Thus, in the dibutylt mechanism and the dibutylt method of the method 1 of the present invention, when raising and lowering the jib, the first hook is fixed to the boom head by the first hook-in support, and the tip of the first wire is It can be removed from the first fixing means and connected to one end of the dibutyl wire. According to such a configuration, it is possible to raise and lower the jib by pulling the dibutyl wire with the first wire without using a hydraulic device dedicated to dibutylate, so that significant weight reduction and cost reduction are possible. Become. In addition, the hook removal operation and the wire diversion work are not required, and the jib can be assembled easily and safely.

  In addition, the dibutylt mechanism and the dibutylt method of the method 2 of the present invention is configured such that the tip of the second wire can be removed from the second fixing means and connected to one end of the dibutyltwire when raising and lowering the jib It has become. According to such a configuration, it is possible to raise and lower the jib by pulling the dibutyl wire with the second wire without using a hydraulic device dedicated to dibutyl, so that significant weight reduction and cost reduction are possible. Become. In addition, the hook removal operation and the wire diversion work are not required, and the jib can be assembled easily and safely.

It is a side view of a rough terrain crane. It is explanatory drawing explaining the guide sheave of the method 1, and winding of a wire, seeing a boom head from the side. It is a side view of jib. It is a flowchart of the method 1 which demonstrated the overhang | extension procedure of jib. It is explanatory drawing explaining the overhang | extension procedure of jib. (A) is a jib holding state and (b) is a jib holding state. It is explanatory drawing explaining the overhang | extension procedure of jib. (A) is a boom raising state, (b) is a wire feeding state, and (c) is a jib releasing state. It is explanatory drawing explaining the overhang | extension procedure of jib. It is in the state of guiding the second wire. It is explanatory drawing explaining the overhang | extension procedure of jib. The jib is tilted by the first wire. It is explanatory drawing explaining the guide sheave of the method 2, and winding of a wire seeing the boom head from the side. It is explanatory drawing of the state which does not use jib. (A) is at the time of using the first hook, and (b) is at the time of using the second hook. It is a flowchart of the method 2 explaining the overhang | extension procedure of jib. It is explanatory drawing explaining the overhang | extension procedure of jib. The jib is tilted by the second wire.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Hereinafter, method 1 will be described in the first embodiment, and method 2 will be described in the second embodiment.

(Constitution)
First, the entire configuration of the rough terrain crane 1 will be described with reference to FIG. Although the rough terrain crane 1 will be described as an example of the mobile crane in the following embodiments, the present invention is not limited to this, and the present invention can be widely applied to mobile cranes such as all terrain cranes.

(Overall configuration of crane)
As shown in FIG. 1, the rough terrain crane 1 according to this embodiment includes a vehicle body 10 as a main body of a vehicle having a traveling function, outriggers 11 provided at four corners of the vehicle body 10,. It has a swivel base 12 mounted so as to be horizontally pivotable, and a boom 14 mounted on a bracket 13 provided upright on the swivel base 12.

  The outrigger 11 can slide out / slide from the vehicle body 10 outward in the width direction by extending or retracting the slide cylinder, and can extend or retract the jack from the vehicle body 10 in the vertical direction by extending or retracting the jack cylinder. It is.

  The swivel base 12 has a pinion gear to which the power of the motor for swiveling is transmitted. The pinion gear is engaged with a circular gear provided on the vehicle body 10 to pivot around the swivel axis. The swivel base 12 has a pilot seat 18 disposed on the front right side, a bracket 13 disposed in the rear center, and a counterweight 19 disposed on the rear lower part.

  The boom 14 is configured to be telescopic by the proximal boom 141, the intermediate boom 142, and the distal boom 143, and can be extended and retracted by a telescopic cylinder (not shown) disposed inside. A plurality of sheaves are disposed at the tip end boom head 144 of the tip boom 143, and the wire 16 is wound around the sheaves, and the hook 17 is suspended.

  Here, the rough terrain crane 1 as a mobile crane according to the present invention includes a first wire 161 and a second wire 162 as the wires 16 and a first hook 171 and a second hook 172 as the hooks 17. The configuration of the boom head 144 will be described later. The first wire 161 is taken in and out by the first winch 41, and the second wire 162 is taken in and out by the second winch 42.

  The outermost proximal end boom 141 is pivotably attached to a support shaft whose base is horizontally installed on the bracket 13, and can be raised and lowered up and down around the support shaft as a rotation center. Furthermore, a relief cylinder 15 is bridged between the bracket 13 and the lower surface of the base end boom 141, and by extending and retracting the relief cylinder 15, the whole boom 14 can be raised and lowered.

  Furthermore, in the rough terrain crane 1 of the present embodiment, the jib 20 and the tension rods 21 and 21 are stored in the sideways holding posture on the side surface of the base end boom 141. The jib 20 and the tension rods 21 and 21 are mounted / stored using a plurality of pins (not shown) and the side up cylinder 31 and the like.

(Configuration of boom head)
Next, the configuration of the boom head 144 will be described using FIG. The boom head 144 is provided with a plurality of guide sheaves (fixed pulleys) 81 to 85 between the left and right side plates. That is, the boom head 144 is rotatably mounted at a position near the upper end of the boom head 144, and a lower sheave at a position near the lower end of the boom head 144 and directly below the upper sheave 81. 82, an intermediate sheave 84 rotatably mounted at a position between the upper sheave 81 and the lower sheave 82, and a tip sheave 85 disposed so as to protrude at a position near the tip of the lower sheave 82 and rotatably mounted And have. On the other hand, the first hook 171 is provided with a hook side sheave 83. In FIG. 2, the first hook 171 is drawn to and fixed to the boom side by the first hook-in support 61.

  Next, the winding of the first wire 161 and the second wire 162 will be described. The first wire 161 is hung in the order of (1) to (8) in FIG. That is, the first wire 161 is fed from the first winch 41 and hooked to (the hook side sheave 83 of) the first hook 171 multiple times via the upper sheave 81 and the lower sheave 82 as the first group sheave. It will be turned. Next, the first wire 161 is fixed to the tip end side of the boom head 144 (position above the tip sheave 85) by the first fixing means 51 via the intermediate sheave 84 as the second group sheave and the upper sheave 81. Be done. The first fixing means 51 can be constituted by, for example, a rope socket and a pin.

  The second wire 162 is hung in the order of (1), (9) and (10) in FIG. That is, the second wire 162 is fed from the second winch 42, and is connected and fixed to the second hook 172 via the upper sheave 81 as the third group of sheaves and the distal sheave 85. The first group of sheaves, the second group of sheaves, and the third group of sheaves can each be composed of one (single) sheave, or can be composed of a plurality of sheaves.

  The first hook-in support 61 is mainly configured by the storage arm 610. The storage arm 610 has a swing axis on the tip end side of a line connecting the center of the lower sheave 82 and the center of the hook side sheave 83. Therefore, by further winding up the first wire 161 after the upper end of the first hook 171 abuts on the storage arm 610, the first hook 171 integrated with the storage arm 610 swings upward (to the proximal side). It is moved and fixed to the storage position along the boom 14 by movement.

(Construction of jib)
Next, the configuration of the jib 20 will be described with reference to FIG. The jib 20 has a box-shaped cross section jib main body 200, two tension rods 21 and 21 stretched between the jib 20 and the boom head 144, and two tension rods 21 and 21. And a dibutyl twire 22. Furthermore, the jib 20 includes a constant pulley 23 fixed to the distal end side of the jib 20, and a moving pulley 24 connected to the tension rods 21 and 21 and slidingly moving in the longitudinal direction of the jib 20. The dibutyl wire 22 is wound around the fixed pulley 23 and the moving pulley 24. One end of the dibutyl wire 22 is adapted to be connected to the first wire 161, and the other end of the dibutyl wire 22 is fixed to the jib 20. Therefore, by pulling the dibutyl wire 22, the moving pulley 24 is pulled toward the tip end of the jib 20 on which the fixed pulley 23 is disposed, and the tension rods 21, 21 are stretched.

  And, the first wire 161, the first hook 171, the first fixing means 51, the second wire 162, the second hook 172, the first hook-in support 61 described above as the configuration on the boom side; and the configuration described above as the jib side The dibutylt mechanism S1 of the method 1 of the present invention is constituted by the tension rods 21 and 21 and the dibutylt wire 22;

(Action)
Next, the action of dibutylt mechanism S1 of method 1 will be described using the flowchart of FIG. 4 and FIGS. 5 to 8. In the following, the respective actions will be described by dividing them into the non-use of jib and the jib extension procedure to the use of jib.

(When not using jib)
First, the non-use of the jib will be described. When the first hook 171 is used, the first hook 171 is removed from the first hook-in support 61 and the first wire 161 is taken in and out from the first winch 41, whereby the first hook 171 is wound up / down. Shown). When the second hook 172 is used, the second hook 172 is wound up / down (not shown) by bringing the second wire 162 into and out of the second winch 42.

(Jib extension procedure)
Next, the zip extension procedure will be described.

(Step S1) The first hook 171 is fixed to the boom head 144 using the first hook-in support 61 (see FIG. 5A).

(Step S2) The jib 20 is moved by the side-up cylinder 31 from the sideways holding state to the lower side holding state. Subsequently, the boom head 144 and the proximal end of the jib 20 are connected by a pin or the like (see FIG. 5B).

(Step S3) The tip of the first wire 161 is released from the first fixing means 51 and connected to the dibutyl wire 22 (see FIG. 5 (b)).

(Step S4) The boom 14 is raised (see FIG. 6A).

(Step S5) Subsequently, the second wire 162 is drawn out (see FIG. 6 (b)).

(Step S6) Next, the jib 20 is swung forward (see FIG. 6 (c)). As a method of swinging the jib 20, it is possible to use a conventional swinging guide, operate in a direction to shorten the first wire 161, or both of them. At this time, it is preferable to guide the second wire 162 using a pin or the like so as to pass through the sheave at the tip of the jib 20 (see FIG. 7).

(Step S7: When using jib)
When the jib is used, the first wire 161 is taken in and out from the first winch 41, and the distance between the fixed pulley 23 of the jib 20 and the moving pulley 24 changes, so that the angle formed between the jib 20 and the tension rods 21, 21 Changes (ie, the jib 20 tilts). Then, at the time of the hanging operation, the second hook 172 is wound up / downd by taking the second wire 162 in and out of the second winch 42 (see FIG. 8). In FIG. 8, a state in which the jib 20 is extended is drawn by a dashed dotted line so that the distinction between the first wire 161 and the second wire 162 can be easily understood.

(effect)
Next, the effects exerted by the dibutylt mechanism S1 and the dibutylt method of the method 1 of the present embodiment will be listed and described.

(1) As described above, the dibutylt mechanism S1 of the method 1 of the present embodiment has the first wire 161 drawn out from the first winch 41 and the first group of guide sheaves 81, 82 as the configuration on the boom side. The first hook 171 hooked to the middle of the first wire 161 via the first and second ends of the first wire 161 via the second group of guide sheaves 84 and 81 is fixed to the distal end side of the boom head 144 Second hook 172 connected to the second wire 162 via the first fixing means 51, the second wire 162 drawn out from the second winch 42, and the third group of guide sheaves 81 and 85, and the first hook A first hook-in support 61 securing the 171 to the boom head 144; on the other hand, a tension tensioned between the jib 20 and the boom head 144 as a configuration on the jib side And the dibutyl wire 22 for tensioning the tension rods 21, 21; when raising the jib 20, the first hook 171 is the boom head by the first hook-in support 61; While being fixed to 144, the tip of the first wire 161 can be removed from the first fixing means 51 and can be connected to one end of the dibutyl wire 22. According to such a configuration, the jib 20 can be raised and lowered by pulling the dibutyl wire 22 with the first wire 161 without using a hydraulic device (hydraulic cylinder or hydraulic hose) dedicated to dibutylate. Significant weight reduction and cost reduction are possible.

  Furthermore, it is not necessary to remove the hook or to fold the wire for dibutylate, and it is possible to assemble the jib 20 easily and safely (improvement of assembly workability). In addition, since the first hook 171 is fixed to the boom 14 when the jib is used, the operator does not have to worry about the swing of the first hook 171 or the contact with the boom 14 (improving operability).

(2) Furthermore, as a configuration on the jib side, a fixed pulley 23 fixed to the tip end side of the jib 20, and a moving pulley 24 connected to the tension rods 21 and 21 and slidingly moving in the length direction of the jib 20 Furthermore, the dibutyl wire 22 is wound around the fixed pulley 23 and the moving pulley 24, and the other end of the dibutyl wire 22 is fixed to the jib 20. According to this structure, the tension of the first wire 161 connected to the dibutyl wire 22 can be doubled to pull the tension rods 21. Conversely, even if a large tension acts on the tension rods 21, the tension acting on the first wire 161 can be reduced.

(3) Moreover, the dibutylt method of the method 1 of the present embodiment is a dibutylt method of a mobile crane provided with the dibutylt mechanism S1 described above, and at least, the first hook 171 is boomed using the first hook-in support 61 The step of fixing to the head 144, the step of connecting the boom head 144 and the proximal end of the jib 20 by a pin, and the end of the first wire 161 are removed from the first fixing means 51 to one end of the dibutyl wire 22 And a step of winding the first wire 161 by the first winch 41. Therefore, since the jib 20 can be raised and lowered by pulling the dibutyl wire 22 by the first wire 161 without using a hydraulic device dedicated to dibutylate, significant weight reduction and cost reduction can be achieved. Furthermore, the hook removing operation and the wire dilating operation for dibutyl are not required, and the jib 20 can be assembled easily and safely.

  Hereinafter, the dibutylt mechanism S2 of another mode different from the embodiment 1 will be described with reference to FIGS. 9 to 12. The same or equivalent parts as the contents described in the above embodiment will be described with the same reference numerals.

(Overall configuration of crane)
The overall configuration of the rough terrain crane 1 is the same as that of the first embodiment, so the description will be omitted.

(Configuration of boom head)
Next, the configuration of the boom head 144 will be described with reference to FIG. The boom head 144 includes a plurality of guide sheaves (fixed pulleys) 81 to 85 between the left and right side plates, as in the first embodiment. That is, the boom head 144 includes an upper sheave 81, a lower sheave 82, an intermediate sheave 84, and a tip sheave 85. On the other hand, the first hook 171 is provided with a hook side sheave 83. In FIG. 9, the first hook 171 is drawn to and fixed to the boom side by the first hook-in support 61.

  Next, the winding of the first wire 161 and the second wire 162 will be described. The first wire 161 is hung in the order of (1) to (9) in FIG. That is, the first wire 161 is fed from the first winch 41 and hooked to (the hook side sheave 83 of) the first hook 171 multiple times via the upper sheave 81 and the lower sheave 82 as the first group sheave. It will be turned. Next, the first wire 161 is connected and fixed to the second hook 172 via the intermediate sheave 84 as the second group of sheaves, the upper sheave 81, and the tip sheave 85.

  The second wire 162 is hung in the order of (1) and (10) in FIG. That is, the second wire 162 is fed from the second winch 42, and the tip end side of the boom head 144 (the position above the tip sheave 85) by the second fixing means 52 via the upper sheave 81 as the third group sheave. Fixed to). The first group of sheaves, the second group of sheaves, and the third group of sheaves can each be composed of one (single) sheave, or can be composed of a plurality of sheaves. The second fixing means 52 can be constituted by, for example, a rope socket and a pin.

  The configuration of the first hook-in support 61 is the same as that of the first embodiment, and thus the description thereof is omitted.

  The second hook-in support 62 is mainly configured by the storage arm 620. The storage arm 620 is fixed to be positioned on the boom head 144 directly above the second hook 172. Therefore, when the upper end of the second hook 172 abuts on the storage arm 620, the second hook 172 is fixed at the storage position.

(Construction of jib)
The configuration of the jib 20 is the same as that of the first embodiment, so the description thereof is omitted.

  And, the first wire 161, the first hook 171, the second wire 162, the second hook 172, the second fixing means 52, the first hook-in support 61, the second hook-in support 62 described above as the configuration on the boom side; The dibutylt mechanism S2 of the method 2 of the present invention is constituted by the tension rods 21 and 21 and the dibutylt wire 22 described above as the configuration on the jib side.

(Action)
Next, the operation of the dibutylt mechanism S2 of method 2 will be described using the flowchart of FIG. 11 and FIGS. 5 to 8 and FIGS. 10 and 12. In the following, the respective actions will be described by dividing them into the non-use of jib and the jib extension procedure to the use of jib.

(When not using jib)
First, the non-use of the jib will be described. When the first hook 171 is used, after the second hook 172 is stored by the second hook-in support 62, the first hook 171 is removed from the first hook-in support 61 and the first wire 161 is taken in and out from the first winch 41. Thus, the first hook 171 is rolled up / down (see FIG. 10A).

  When the second hook 172 is used, after the first hook 171 is stored by the first hook-in support 61, the second hook 172 is removed from the second hook-in support 62 and the first wire 161 is taken in and out from the first winch 41. Thus, the second hook 172 is rolled up / down (see FIG. 10 (b)).

(Jib extension procedure)
Next, the zip extension procedure will be described. In addition, about the code | symbol of FIGS. 5-8, the code | symbol in () is referred to about what attached | subjected ().

(Step S1) The first hook 171 is fixed to the boom head 144 using the first hook-in support 61 (see FIG. 5A).

(Step S2) The jib 20 is moved by the side-up cylinder 31 from the sideways holding state to the lower side holding state. Subsequently, the boom head 144 and the proximal end of the jib 20 are connected by a pin or the like (see FIG. 5B).

(Step S3) The tip of the second wire 162 is released from the second fixing means 52 and is connected to the dibutyl wire 22 (see FIG. 5 (b)).

(Step S4) The boom 14 is raised (see FIG. 6A).

(Step S5) Subsequently, the first wire 161 is drawn out (see FIG. 6 (b)).

(Step S6) Next, the jib 20 is swung forward (see FIG. 6 (c)). As a method of swinging the jib 20, it is possible to use a conventional swinging guide, operate the second wire 162 in a direction to shorten it, or both of them. At this time, it is preferable to guide the first wire 161 using a pin or the like so as to pass through the sheave at the tip of the jib 20 (see FIG. 7).

(Step S7: When using jib)
When the jib is used, the second wire 162 is pulled in and out from the second winch 42, and the distance between the fixed pulley 23 of the jib 20 and the moving pulley 24 changes, so that the angle formed between the jib 20 and the tension rods 21, 21 Changes (ie, the jib 20 tilts). Then, at the time of the hanging operation, the second hook 172 is wound up / downd by taking the first wire 161 into and out of the first winch 41 (see FIGS. 8 and 12). Note that, in FIG. 12, the state in which the jib 20 is extended is drawn by an alternate long and short dash line so that the distinction between the first wire 161 and the second wire 162 can be easily understood.

(effect)
Next, the effects exerted by the dibutylt mechanism S2 and the dibutylt method of method 2 of the present embodiment will be listed and described.

(1) As described above, the dibutylt mechanism S2 of the method 2 of the present embodiment has the first wire 161 drawn from the first winch 41 and the first group of guide sheaves 81, 82 as the boom side configuration. And a second hook 172 connected to the tip of the first wire 161 via the second group of guide sheaves 84, 81, 85. Second fixing means 52 for fixing the second wire 162 drawn from the second winch 42 and the tip end of the second wire 162 passing through the third group of the guide sheave 81 to the tip end side of the boom head 144; A first hook-in support 61 for fixing the hook 171 to the boom head 144 and a second hook-in support 62 for fixing the second hook 172 to the boom head 144 The jib-side configuration includes tension rods 21 and 21 stretched between the jib 20 and the boom head 144, and a dibutyl wire 22 for stretching the tension rods 21 and 21; and the jib 20 The tip of the second wire 162 can be removed from the second fixing means 52 and connected to one end of the dibutyl wire 22 when raising or lowering the. According to such a configuration, since the jib 20 can be raised and lowered by pulling the dibutyl wire 22 with the second wire 162 without using a hydraulic device dedicated for dibutyl, significant weight reduction and cost reduction can be achieved. Is possible.

  Furthermore, it is not necessary to remove the hook or to fold the wire for dibutylate, and it is possible to assemble the jib 20 easily and safely (improvement of assembly workability). In addition, since the second hook 172 is fixed to the boom 14 when the first hook 171 is used, the operator does not have to be concerned about the swing of the second hook 172 or the contact with the boom 14. Conversely, when the second hook 172 is used, the first hook 171 is fixed to the boom 14 (improving operability).

(2) Furthermore, as a configuration on the jib side, a fixed pulley 23 fixed to the tip end side of the jib 20, and a moving pulley 24 connected to the tension rods 21 and 21 and slidingly moving in the length direction of the jib 20 Furthermore, the dibutyl wire 22 is wound around the fixed pulley 23 and the moving pulley 24, and the other end of the dibutyl wire 22 is fixed to the jib 20. According to this structure, the tension of the second wire 162 connected to the dibutyl wire 22 can be doubled to pull the tension rods 21. Conversely, even if a large tension acts on the tension rods 21, the tension acting on the second wire 162 can be reduced.

(3) Moreover, the dibutylt method of the method 2 of this embodiment is a dibutylt method of a mobile crane provided with the dibutylt mechanism S2 described above, and at least, the first hook 171 is boomed using the first hook-in support 61. The step of fixing to the head 144, the step of connecting the boom head 144 and the proximal end of the jib 20 by a pin, and the tip of the second wire 162 are removed from the second fixing means 52 And a step of winding the second wire 162 by the second winch 42. Therefore, since the jib 20 can be raised and lowered by pulling the dibutyl wire 22 with the second wire 162 without using a hydraulic device dedicated to dibutylate, significant weight reduction and cost reduction can be achieved. Furthermore, the hook removing operation and the wire dilating operation for dibutyl are not required, and the jib 20 can be assembled easily and safely.

  The other configurations and operational effects are substantially the same as those of the above-described embodiment, and hence the description thereof is omitted.

  Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes to the extent not departing from the scope of the present invention are included in the present invention. included.

1: Rough terrain crane (mobile crane);
20: jib; 21: tension rod;
22: Dibutyltwire; 23: Fixed pulley; 24: Moving pulley;
14: Boom; 144: Boom head;
16: wire; 161: first wire; 162: second wire;
17: hook; 171: first hook; 172: second hook;
41: 1st winch; 42: 2nd winch;
51: first fixing means; 52: second fixing means;
61: 1st hook in support; 62: 2nd hook in support;
81: upper sheave; 82: lower sheave; 83: hook side sheave;
84: Middle sieve; 85: Tip sieve

Claims (5)

Dibutylt mechanism of mobile crane;
As a configuration on the boom side,
A first wire fed from a first winch,
A first hook wound around the first wire via a first group of guide sheaves;
First fixing means for fixing the tip end of the first wire via the second group of guide sheaves to the tip end side of the boom head;
A second wire fed from a second winch,
A second hook connected to the second wire via a third group of guide sheaves;
A first hook-in support for securing the first hook to the boom head;
As the configuration of the jib side,
A tension rod tensioned between the jib and the boom head;
A dibutyl wire for tensioning the tension rod;
When raising and lowering the jib, the first hook is fixed to the boom head by the first hook-in support, and the tip of the first wire is removed from the first fixing means and the dibutyl wire is removed. Can be connected to one end of the dibutylt mechanism. Dibutylt mechanism of mobile crane;
As a configuration on the boom side,
A first wire fed from a first winch,
A first hook wound around the first wire via a first group of guide sheaves;
A second hook connected to the tip of the first wire via a second group of guide sheaves;
A second wire fed from a second winch,
Second fixing means for fixing the tip end of the second wire via the third group of guide sheaves to the tip end side of the boom head;
A first hook-in support for securing the first hook to the boom head;
A second hook-in support for fixing the second hook to the boom head;
As the configuration of the jib side,
A tension rod tensioned between the jib and the boom head;
A dibutyl wire for tensioning the tension rod;
The tip of the second wire can be removed from the second securing means and connected to one end of the dibutyl wire when raising and lowering the jib; dibutyl mechanism. The configuration of the jib further includes a constant pulley fixed to the jib, and a moving pulley connected to the tension rod and slidingly moving in the longitudinal direction of the jib,
The dibutylate according to claim 1 or 2, wherein the dibutyltwire is wound around the fixed pulley and the moving pulley, and the other end of the dibutyltwire is fixed to the jib. mechanism. A dibutylt method of a mobile crane provided with a dibutylt mechanism according to claim 1, comprising:
Securing the first hook to the boom head using the first hook-in support;
Connecting the boom head and the proximal end of the jib with a pin;
Removing the tip of the first wire from the first fixing means and connecting it to one end of the dibutyl wire;
Winding the first wire with the first winch. A dibutylt method of a mobile crane provided with a dibutylt mechanism according to claim 2, comprising:
Securing the first hook to the boom head using the first hook-in support;
Connecting the boom head and the proximal end of the jib with a pin;
Removing the tip of the second wire from the second fixing means and connecting it to one end of the dibutyl wire;
Winding the second wire with the second winch.